<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 警告区 -->
      <el-alert
        title="注意！只允许为第三级分类设置参数！"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>
      <!-- 选择商品分类区 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数的面板  -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态表格数据 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column label="展开" width="80px" type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="handleClose(index,scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!-- 循环渲染tag标签 -->
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column label="索引" width="80px" type="index">
            </el-table-column>
            <el-table-column label="参数名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作" width="150px">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  :disabled="isBtnDisabled"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  :disabled="isBtnDisabled"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--添加静态属性的面板  -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格数据 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column label="展开" width="80px" type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="handleClose(index,scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!-- 循环渲染tag标签 -->
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column label="索引" width="80px" type="index">
            </el-table-column>
            <el-table-column label="属性名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作" width="150px">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  :disabled="isBtnDisabled"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  :disabled="isBtnDisabled"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的具体表单内容 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 修改参数的具体表单内容 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类数据列表
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
        expandTrigger: "hover",
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称，默认选中第二个
      activeName: "many",
      // 这是动态参数的数据
      manyTableData: [],
      // 这是静态参数的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      // 表单验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },

      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {
        attr_name: "",
      },
      // 表单验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
    };
  },
  created() {
    // 获取所有的商品分类
    this.getCateList();
  },
  methods: {
    // 获取所有的商品分类
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类列表失败");
      } else {
        this.cateList = res.data;
        console.log(this.cateList);
      }
    },

    // 级联选择框选择项变化时的回调方法
    handleChange() {
      this.getParamsData();
      console.log(this.selectedCateKeys);
    },

    // tab页签点击事件的回调函数
    handleTabClick() {
      this.getParamsData();
      console.log(this.activeName);
    },

    // 获取参数的数据列表
    async getParamsData() {
      // 当选中的不是三级分类时
      if (this.selectedCateKeys.length !== 3) {
        this.cateList = [];
        this.manyTableData=[];
        this.onlyTableData=[]
        return;
      } else {
        console.log(this.selectedCateKeys);
        // 根据所选分类的id和当前所处的面板，获取对应的参数
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: this.activeName } }
        );
        console.log(res);
        if (res.meta.status !== 200) {
          return this.$message.error("获取参数列表列表失败");
        } else {
          console.log(res.data);
          // 将返回的数据中的“参数字符串”用split方法转为字符串数组，条件是从每个字符串的空格处开始分割，用三元表达式判断是否为空，空则不转换，并赋值给 item.attr_vals，供后续展开项使用
          res.data.forEach((item) => {
            item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
            // 为表格中的每一条数据，控制标签文本框的显示与隐藏
            item.inputVisible=false;
            // 为表格中的每一条数据，标签文本框输入的值
            item.inputValue=''
          });
          console.log(res.data);
          if (this.activeName === "many") {
            this.manyTableData = res.data;
          } else {
            this.onlyTableData = res.data;
          }
        }
      }
    },

    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },

    // 点击按钮，确认添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return;
        } else {
          const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName,
            }
          );
          console.log(res);
          if (res.meta.status !== 201) {
            return this.$message.error("添加参数列表列表失败");
          } else {
            this.$message.success("添加参数列表列表成功");
            this.getParamsData();
            this.addDialogVisible = false;
          }
        }
      });
    },

    // 点击按钮，弹出修改参数的对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: {
            attr_sel: this.activeName,
          },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败");
      } else {
        this.editForm = res.data;
      }
      this.editDialogVisible = true;
    },

    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },

    // 点击按钮，确认提交修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) {
          return;
        } else {
          const { data: res } = await this.$http.put(
            `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
          );
          if (res.meta.status !== 200) {
            return this.$message.error("修改参数失败");
          } else {
            this.$message.success("修改参数成功");
            this.getParamsData();
            this.editDialogVisible = false;
          }
        }
      });
    },

    // 根据id删除对应的数据,confirm返回的是一个promise对象，所以用async简化一下
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      // 简化后的confirm会返回两个字符串，confirm（确认），cancel（取消），可以此判断用户的操作类型
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除");
      } else {
        // 向后台请求删除数据
        const { data: res } = await this.$http.delete(
          ` categories/${this.cateId}/attributes/${attr_id}`
        );
        console.log(attr_id);
        console.log(res);
        if (res.meta.status !== 200) {
          return this.$message.error("删除失败");
        } else {
          this.$message.success("删除成功");
          this.getParamsData();
        }
      }
    },

    //文本框失去焦点或按下enter都会触发,向后台发送添加的参数
    async  handleInputConfirm(row){
      console.log('ok');
      // 判断输入的值是否为空或合法，不合法的话就重置清空，并且返回，不再执行下一步，trim是字符串去除两端空格的方法
      if(row.inputValue.trim().length===0){
        row.inputVisible='';
        row.inputVisible=false;
        return;
      }else{
        // 输入内容合法，没有return，做后续处理，即向数组中添加商品新的参数
        row.attr_vals.push(row.inputValue.trim())
        // 添加完成，重置输入框,然后切换至按钮
        row.inputValue='';
        row.inputVisible=false;
        // 发起请求，向后台插入这次输入的请求
        const {data:res} =await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {attr_name:row.attr_name,
         attr_sel:row.attr_sel,
         attr_vals:row.attr_vals.join(' ')});
        if (res.meta.status !== 200) {
        return this.$message.error("修改参数失败");
      } else {
        this.$message.success("修改参数成功");
      }
      }
    
    } ,

    //点击按钮，展示文本输入框 
    showInput(row){
      row.inputVisible=true;
      // 让文本框自动获得焦点
      // $nextTick方法，当页面上的元素被重新渲染之后，才会指定回调函数中的代码
       this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },

    // 将对attr_vals的操作保存在数据库
    async savaAttrVals(row){
        const {data:res} =await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {attr_name:row.attr_name,
         attr_sel:row.attr_sel,
         attr_vals:row.attr_vals.join(' ')});
        if (res.meta.status !== 200) {
        return this.$message.error("修改参数失败");
      } else {
        this.$message.success("修改参数成功");
      }
    },

    //删除对应的标签项 
    handleClose(index,row){
      row.attr_vals.splice(index,1);
      this.savaAttrVals(row);
    }
  },

  computed: {
    // 如果按钮被禁用，返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      } else {
        return false;
      }
    },

    // 获取三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      } else {
        return null;
      }
    },

    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    },
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0px;
}

.input-new-tag{
  width: 120px;
}
</style>